For its entire length, the Dnepr-Donbass canal traverses the bottom lands and primary and secondary terraces e{edI{g
of the Orel', Orel'kya, Britai, and Bereka Rivers. Ground water is encountered at a level of from 0.5 to 2-3 +zxj-di M
m below the surface. Ground water appears here and there on the exposed surface at points in depressed areas, .I{b]6
forming stagnant sections. All basic hydraulic structures on the canal are below ground-water level and require Sf>R7.lpP
dewatering of the foundation pits. _8C 0z=hz
Using methods of deep dewatering, the ground-water level has been lowered by 8-9 m in the foundation pits N> R abD
for the siphons, and by 10.5-17 m in the pumping station pits. The foundation pits for the structures located in ~e r}O K3J
bottom lands are surrounded by a cofferdam I0 m wide to protect against flood waters. Here, the seasonal fluctuations &sL(|>N
in the ground-water level reach 2-8 m. The pumping station pits were excavated by dry land machines; (: IUg
while siphon pits were opened by the method of hydromechanization to a depth of 6 m with shaping to the design SCk2D!u
elevation by dry-land machines.
